The article describes it as:
"
Den er mørkeblå, nesten svart i fargen. Den veier omkring 1,5 kilo og kan til forveksling se ut som en eller annen type tropefisk."
It is dark blue, almost black in colour. It weighed around 1.5 kilo and could be one or another type of tropical fish.
Further down people have concluded, where opinons differ a little:
"Dette tror jeg ganske sikkert er en engelsk svartfisk (Schedophilus medusophagus). Den dukker opp en gang i blant langs norskekysten "
Which translates to: I am pretty certain it is an English Blackfish, (Schedophilus medusophagus) It turns up from time to time along the Norwegian coast.
Then someone else offers:
"Dette er enten svartfisk (Centrolophus niger) eller engelsk svartfisk (Schedophilus medusophagus). Bildet er for dårlig til å si hvilken av de det er. Regelmessig gjest langs kysten, sjeldnere inne i fjordene. Finnes som regel lenger sør i Atlanterhavet, men også rundt de Britiske øyer og Nordsjøen. "
Translation:This is either a Blackfish (Centrolophus niger) or an English Blackfish (Schedophilus medusophagus). The picture is too poor to say for cetain which one it is. A regular guest along the coast, seldom seen in the fjords. As a rule it is found along the Atlantic Ocean but also round the British Isles and the North Sea.
So, there you ar then, either a Blackfish or an English Blackfish.
My Norwegian is a bit rusty but I think I've got most of it right. . . . .